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rdp ---------- Forwarded message ---------- From: carolus prasetyadi <[email protected]> Date: 2010/11/13 Subject: kaitan gempa tektonik dan aktifitas erupsi gnapi To: [email protected] Cc: [email protected] Mas Rovicky, Saya kirim abstract sebuah paper dari website Badan Geologi yg membahas keterkaitan gempa tektonik dengan aktifitas gnapi. Tadinya saya kirim ke mailist iaginet ttp tdk tahu kenapa, sdh 2 kali kirim mental terus. Saya kirim ke njenengan dengan harapan dpt di share ke mailist iaginet atau mana saja. Many thanks for your help. Salam, C.Prasetyadi Jur T Geologi UPNV Jogja Merapi Workshop 2006, Yogyakarta Indonesia Workshop on “Merapi and Merapi Type Volcanoes in The World with Their Phenomena” Stress Triggering of Volcanic Activity: Lessons for Merapi Volcano T.R. Walter GFZ Potsdam, Germany (www.gfz-potsdam.de/pb2/pb21/) Abstract Historical records contain numerous incidences of unusual and highly explosive volcanism following large earthquakes. In Japan, Mount Fuji erupted one month after a magnitude M8.2 earthquake in 1707. In Chile, Charles Darwin described volcanoes that began erupting after an earthquake in 1835. The Plinian eruption of Santa Maria volcano in Guatemala followed a M8.3 subduction earthquake in 1902. The cataclysmic eruption of Mount Pinatubo in the Philippines followed a M7.7 earthquake in 1990, and eruptions of Vesuvius in Italy are also related to earthquakes in the southern Apennines. Understanding how earthquakes trigger volcanic activity is important for the interpretation of eruption precursors and for volcano risk mitigation. Merapi volcano showed repeatedly striking evidences of an interaction with tectonic earthquakes. Two earthquakes M6.3 occurred in 2001 and 2006 at a distance of 40-60 km south of Merapi. The last two eruptive phases of Merapi commenced in 1/2001 and in 5/2006. In 5/2001 the first M6.3 earthquake occurred, and was followed by a change of fumarole activity at the volcano summit, with a sudden fumarole temperature increase of ~25 °C within seconds to a few minutes after the earthquake (M. Zimmer, pers. comm.). In 5/2006, the second M6.3 earthquake occurred and was again influencing the activity at Merapi, this time Merapi was displaying a 2-5 fold increase of dome growth and pyroclastic flow formation compared to the pre-earthquake rate. In this study we analyze the volcano-earthquake interaction at Merapi volcano, using numerical models to better understand the mechanisms of interaction. Using the three dimensional elastic dislocation theory, we compute dynamic and static stress changes related to the dislocation sources. Our models do not show that the M6.3 earthquakes were not caused by the volcanic activity at Merapi. However, our models show that the tectonic earthquakes lead to static and dynamic stress changes that may be the cause of increased volcanic activity at Merapi. For the 2001 earthquake, dynamic stress triggering is a likely reason. For the 2006 earthquake, in turn, dynamic and also static stress changes reached values known to be significant for volcano triggering. These results may become important for assessment of volcano activity in this tectonically active environment (**). (Diunduh pada 13 November 2010, dari http://www.merapi.bgl.esdm.go.id/pages.php?page=pustaka-artikel&id=45). -- Pray for JOGJA -------------------------------------------------------------------------------- PP-IAGI 2008-2011: ketua umum: LAMBOK HUTASOIT, [email protected] sekjen: MOHAMMAD SYAIFUL, [email protected] * 2 sekretariat (Jkt & Bdg), 5 departemen, banyak biro... -------------------------------------------------------------------------------- Ayo siapkan diri....!!!!! Hadirilah PIT ke-39 IAGI, Senggigi, Lombok NTB, 22-25 November 2010 ----------------------------------------------------------------------------- To unsubscribe, send email to: iagi-net-unsubscribe[at]iagi.or.id To subscribe, send email to: iagi-net-subscribe[at]iagi.or.id Visit IAGI Website: http://iagi.or.id Pembayaran iuran anggota ditujukan ke: Bank Mandiri Cab. Wisma Alia Jakarta No. Rek: 123 0085005314 Atas nama: Ikatan Ahli Geologi Indonesia (IAGI) Bank BCA KCP. Manara Mulia No. Rekening: 255-1088580 A/n: Shinta Damayanti IAGI-net Archive 1: http://www.mail-archive.com/iagi-net%40iagi.or.id/ IAGI-net Archive 2: http://groups.yahoo.com/group/iagi --------------------------------------------------------------------- DISCLAIMER: IAGI disclaims all warranties with regard to information posted on its mailing lists, whether posted by IAGI or others. In no event shall IAGI or its members be liable for any, including but not limited to direct or indirect damages, or damages of any kind whatsoever, resulting from loss of use, data or profits, arising out of or in connection with the use of any information posted on IAGI mailing list. ---------------------------------------------------------------------
